Grease and oil interceptor



Nav. 24, 1942. E. w, N, BoosEY- amsn Ayn onJ zmncmons vFiled May l5.194i() 4 l INVNTOR." @afm/ W /V. 50066)/ BY.

W i /7'v Patented Nov. 24, 1942 UNETEB STAT iiTiNT OFFICE 5 Claims.

discharge of additional liquid thereto tending to increase headpressure, liquid will discharge to the outlet without decrease in volumeof air at the top of the interceptor body.

In previous structures in which an air space is provided in the top ofthe body air may be discharged to the outlet as the liquid level risesand thus the head pressure will Vary in the intercept-or. In my improvedconstruction a permanent head pressure is provided which prevents surgeof liquid within the body and an air lock is provided to maintain apredetermined volume of air and gas in the interceptor and permitsexcess air and gas to pass to the outlet.

These and other objects and features of the invention are hereinaftermore fully described and claimed and shown in preferred form in theaccompanying drawing in which- Fig. l is a vertical section of one formof my improved grease interceptor.

Fig. 2 is a plan View thereof.

Fig. 3 is a section taken on line 3 3 of Fig. l.

Fig. 4 is a section taken on line li-t of Fig. l.

In the ferm of the invention shown in Fig. l the body of the interceptoris indicated at I and has an inlet 2 on one side below the liquid leveland an outlet 3 on the opposite side the lowermost point of which isabove the liquid level.

The inlet 2 opens to a vertical chamber 4 provided on the inlet side ofthe body and is separated from the interior 5 oi" the body by thevertical wall Si which terminates below the top of the body and abovethe normal liquid level at the point 'I. The wall 6 is integral with theinlet end wall of the body and has an aperture vIi opening to the bottomof the vertical chamber 4 and is also provided with an aperture abovethe aperture 8 the purpose of which aperture 9 is to permit greases topass from the interior of the body to the vertical chamber 4 when greaseaccumulates within the interior of the body to a depth to pass throughthe aperture Si. This grease may flow upward to the inlet 2 and clog thesame thereby requiring the grease to be withdrawn to permit theinterceptor to function. In this manner the interceptor is preventedfrom becoming overloaded.

The opposite end of the body is provided with a conduit-like portion Iiiextending outwardly from the body as shown in Fig. 2 and to the upperend of which the outlet conduit 3 is connected. There is an integralwall II at the outlet having an opening I2 therein at the bottom of theinterceptor and extends at the upper end to above the liquid level inthe chamber and is spaced from the top of the body to provide an airpassageway Ili. There is also a depending baille plate I5 extending fromthe top downwardly to below the top 'l of the wall B adjacent theoutlet. The bottom I G of the wall I5 extends a short distance below thelowermost point of the outlet 3. The normal water level, indicated bythe dotted line I'I, is thus slightly above the lowermost point of theoutlet 3 and slightly below the upper end l of the wall E5.

With this described arrangement of parts the device operates as follows:Assuming that the interceptor contains liquid indicated at the level I7,inow of additional liquids through the inlet 2 discharges into thepassageway 4 and tends to raise the water level and, as the level rises,air is compressed in the upper part of the chamber until the liquidbegins to iiow to the outlet the lowermost point of which is the `Iiowlevel in the interceptor body. It will be noted that increase in airpressure in the top of the interceptor will cause the same to by-pass tothe outlet below the -edge I6 of the `baiile plate I5. Thus there willbe no accumulation of gases above the liquid level in the normaloperation of the device inasmuch as an accumulation would tend toincrease the vol-- ume of air and gas on the top of the liquid and thustend to increase the pressure of gases causing discharge of excess airand gas to the outlet. In other words to provide a substantiallypermanent head pressure in the body.

It will be further noted that the upper end l of the Wall I is a littleabove the normal liquid level and that greases and oils in the liquiddie charging into the vertical chamber 4 at each flushing will to amajor extent pass over the top 'I of the wall 6 to the top of the liquidbetween the walls 6 and II and, as grease accumulates on the liquidbetween the said walls, water will tend to flow from the inlet throughthe apertures 8 and I2 to the outlet. The distance between the walls 6and II is suflicient to permit the greases and oils passing through theaperture 8 to rise to the liquid level and any air discharging with theliquid passing through the inl-et 2 may rise to the top of the body.

When sufficient depth of grease has accumulated in the body it may passto the inlet through the aperture 9 in the wall 6 and nally tend to stopthe inlet thus requiring the grease to be removed from the body toenable the interceptor to again properly function.

In the form of the invention shown in Fig. l there is provided aremovable cover I8, shown in Fig. 2, This cover is sealed to the top ofthe interceptor to prevent escape of gases and air through the top.

The described apparatus is particularly adaptable for use in retainingthe liquid greases and oils ilowing thereinto through the inlet 2 andwhile the term grease is used the principal purpose or" the invention isto prevent oil from passing to the sewer. In either event, however, theoils and greases are held within the interceptor body.

Having thus briefly described my invention, its utility and mode ofoperation, what I claim and desire to secure by Letters Patent of theUnited States is:

1. An oil and grease interceptor comprising a chambered body having aninlet conduit discharging thereto below the normal liquid level therein,an outlet conduit connected to the body near the top and determining thenormal liquid level therewithin, means providing a vertical pasageway atthe outlet side of the body, said passageway having an opening to thebody adjacentI the top and an opening to the body adjacent the bottom,and further being in communication its upper end with the outletconduit, a baffle extending from the top of the body into the verticalpassageway to a point below the normal liquid level in the body wherebyan accumulation of gases and air in the top of the body in volumesunlcient to lower the liquid level approximately to the lower edge ofthe bafile permits air and gases to pass beneath the baille to theoutlet conduit, the arrangement maintaining a substantially constantvolume of air and gas in the body at a substantially constant headpressure.

2. An oil interceptor comprising a chambered body having an inletconduit discharging thereto on one side below the normal liquid leveltherein,

a partition within the body adjacent the inlet side thereof, the upperend of the partition terminating below the top and above the normalliquid level within the body and the lower end of said partition beingspaced from the bottom of the body, said partition providing a verticalpassageway into which the inlet discharges, said partition having anaperture at a distance below the point of discharge of the inlet conduitto the inlet passageway through which oils may pass to the inlet uponaccumulation of oils and greases in the body to the level of the saidopening, means providing an outlet passageway on another side of thebody, said outlet passageway having an opening to the body near thebottom, baille means within the said outlet passageway for maintaining anormal liquid level within the body, said outlet passageway having anopening to the body above the flow level in the body, and said baillemeans being between the said last named opening and the opening of saidoutlet conduit to the body.

3. In a grease and oil interceptor, a chambered body having an inlet andan outlet on opposite sides of the body, a vertical passageway on theexterior of each oi the opposite sides of the body, each of saidvertical passageways having an opening to the body through therespective side walls at the bottom and an opening through therespective side walls at the top of the body above the normal liquidlevel therein, an inlet conduit discharging to the passageway on theinlet side or" the body below the normal liquid level in the body, andan outlet conduit for the passageway on the opposite side of the bodyopening thereto at the upper end and determining the normal liquid levelwithin the body, a baille depending from the top of the body to betweenthe point of connection of the outlet conduit to the passageway and theopening of the said passageway to the top of the body, said bailleterminating at a point below the normal liquid level in the body andproviding for discharge of air and gases from the top of the body to theoutlet upon accumulation of sufficient volume or" gases in the top ofthe body to lower the liquid level to below the lower edge of thebaille, said body being otherwise sealed to atmosphere.

4. A grease and oil interceptor comprising a chambered body having aninlet conduit discharging thereto below the normal liquid level therein,

an outlet conduit connected to the body near the top, the inlet conduitbeing on the opposite side of the body from the outlet conduit, meansproviding a vertical passageway on the exterior of the inlet side of thebody into which the inlowing liquid discharges, said vertical passagewayterminating at the top above the normal liquid level in the body andarranged at the bottom to permit liquid to pass into the interior of thebody, means providing a vertical passageway on the exterior of theoutlet side of the body, the outlet conduit opening to near the top ofthe body, leans associated with the outlet for determining the normalliquid level in the body above the lowerrncst point of the outlet andbelow the uppermost point oi the said inlet passageway and providing anair space in the top of the body, a baille at the outlet depending fromthe top of the body and extending to below the liquid level in the bodya d noinally sealing the air space in the body iron the outlet, thearrangement providing that as the liquid level is lowered by increase involume of gas and air in said air space to below the lower edge of thebaille gases are permitted to pass to the outlet and thus reestablichthe liquid level under normal head pressure within t e interceptor.

5. In an oil and grease interceptor, a chamber-ed body having a top andbottom, an inlet on one side ol' the body and an outlet on the oppositeside, the inlet providing i'or discharge of liquid to the E dy below theliquid level therein, and the o et oper ig to the body at a point abovethe inlet and below the top determining the normal liquid level in thebody and providing an air and @es space thereabove at normal headpressure i thin the body, means providing a vertical way at the inlet inwhich air and lighter liqun such as oil and greases may rise to the topof the liquid body and permitting the heavier liquid to fall to thebottom of the interceptor, means providing a vertical passagewayadjacent the outlet open at its top to the top of the body and open atthe bottom to the bottom of the intercep or, a baille at the top of thepassageway at 'the outlet extending from the top oi" the body to belowthe liquid level therein and normally the outlet from the said air spaceabove the liquid level, said baille providing a means whereby increasein volume of air and gases in the body lowers the liquid level to belowthe lower of the baille thereby opening the said air and gas space tothe outlet to permit discharge ci' excess gases to the outlet andrestoring the normal liquid level to again seal the said air space tromthe outlet.

EDWARD W. N. BOOSEY.

